A 4k intro entry for the Assembly 2013. This entry was 3rd. The intro runs completely using compute shaders (cs5.0). In the intro, there are 65536 dynamic cubes flying around. The visuals are raytraced (there is one shadow ray and one reflection ray). To accelerate the raytracing, a 3D grid is built every frame, where on each cell there is a linked list of all cubes that possibly intersect the area and this 3D volume is then stepped over when raytracing.